For some reason any time I try to log onto any server it says The Server encountered an unexpected condition which prevented it from fulfilling the request. Anyone else have this problem? and how do I fix it? what is going on?

I also have the same problem. I'll do some research to find out what it means.
Edit: Minecraft session encountered an internal error... unfortunately, no server can be accessed at this time.http://xpaw.ru/mcstatus/